OBSERVATIONS ON THE INFECTION OF 

 CRATAEGUS BY GYMNOSPORANGIUM 1 



J. F. Adams 



An interesting growth of the red cedar (Juniperus virginiana) 

 and hawthorns (Crataegus spp.) is found on the slopes of Tussey 

 Mountain at Mussers Gap, Center County, Pennsylvania. They 

 comprise the shrubbery growth within an old cleared area of 

 twenty-five acres, now used for a pasture, which is surrounded by 



Fig. i. A dense growth of hawthorns as it appears in early spring. 



a secondary growth of oak trees. In certain areas the hawthorns 

 are close together and form a very dense growth, as shown in 

 figure i. The cedars and hawthorns are often found associated 

 as shown in figure 4. The majority of the cedars, however, are 

 in rather restricted groups surrounding the hawthorns. Thirteen 

 specimens of hawthorns have been identified in this area. Several 

 trees of Mains glaucescens have been found also adjacent to this 



1 Contribution from the Department of Botany. The Pennsylvania State 

 College, No. 25. 



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